Bridge for ophthalmic mountings



mlm DesT 21%, 1927 Patented Dec. 29, 1931 1er-rain stares HARRY H. sTYLL, or soUtri-realises;MASSACHUSETTSl` Application med December 15; 1927;v serial- N'o. monto.

rIhis invention relates to improvements in means for connecting the lens holding members of ophthalmic mountings and has particular ref v justing the said lens holding means toa required separation.

The principal object of the invention is to provide improved means for regulating the distance between the lens holding members of ophthalmic mountings. y

c Another object of the invention is to provide improved means for connecting the lens holding members of ophthalmic mountings which may be adjusted to regulate the distance between the lens holding means, at the same time being foldable.

Another object of the invention is to provide improved means for regulating the distance between the lens holding members of an ophthalmic mounting which will be foldable and at the same time adjustable as to the distance between the lensV holding members by twisting.

Other objects and advantages of the invention will be apparent from the following description taken in' connection with theV accompanyinn drawings and it will be understood that many changes may be made in the arrangement of parts and details of construction without departing from the spirit of the invention asexpressed in the accompanying claims. I, therefore, do not wish to be limited to the eXact details of construction' Vand arrangements of parts shown as the preferred forms only have been shown by way of illustration.

In that type of ophthalmic mountingsV usually known as protective goggles it has been customary to connect the two lens holding members by means of a chain so that simply by twisting one lens holding member with respect to the other the chain will be twisted and shortened thus changing the distance between the two lens holding members. This has proved a very useful and practical rerence to improved means for ad- ,Y

device.y It has', however, one outstanding disadvantage, namely, that when the-mounting istaken oft the face ofthe wearerthe chain the adjustment for the pupillary distance of the wearer Iis lost so that this pupillary distancelias to be adjusted by twisting4 the chain `eachtime that the wearer puts on the mountmg; i

In my improved device Ipreserve the Hexibility'of the chain bridge but I'v provide improved means therein by which the adjust- Vment for the pupillary distance is maintained and notlost each time the mounting is taken o theface. With my device, there- 'forepthelens holding members may be folded with respect one'to the other just as with the priorzart chain bridge and the pupillary distancexof the mounting be maintained.V

Referring to the drawings Fig. l is a front view partially in section showing the invention withthe lens holding members extended to'their fullest separation;

' Fig.` 2` is a view similar to Fig. l showing the lens holding. members adjusted closer together than in F ig; l; n

Fig.- 8 is a top orplan viewv of Figs. l and 2;

Fig. 4 is a cross 'section on` line 4-4 of Fig. l;

Fig. 5 is a cross section on line 5 5 of Fig; Gleis-a` partial view similarto Figsyl and `2 showing a modication.

Referring. to the drawings whereinsimilar characters of reference denote corresponding parts throughout',` the lenses l are held in the lens holding members 2 which may be in the form ofgan eye cup as shown in Fig; 3, being cut along the line 3 to'fit the face.V The lens holding lmembers may be held in place on the face by means-of 'the headband orrstrap 4: secured to thelens holding members 2. `On each lens holding member 2 is astaple 5 which may be bent or extendedout as shown in Fig;

3 to allow more room for the nose. Fitting in the staple 5 is the ring 6 through which is passed a bendable wire bridging member 7 and over the bendable wire 7 is placed a nose engaging member 8 which is preferably a section of soit rubber` tubing.

l shows the bendable wire 7 in the form of an open loop or link and this is the initial position et the member 7 with respect to the other members of the mounting. The operation of the device is as follows: lf it is desired to shorten the distance between the lens holding members 2 the member 7 is t vvisted as indicated in Fig. 2. rlhis twisting shortens the member 7. It will thus be seen that by twisting the bendable wire 7 the distance between the lens holding members 2 may be regulated to accommodate Athe pupillary distance of the wearer and due to the staple 5 and the link G connecting the bendable member 7 one lens holding member 2 may be folded with respect to the other thus providing a bridging member that may not only be shortened or lengthened simply by twisting but one that will maintain its adjustment until itis deliberately twisted again for some other adjustment. rlhe nose engaging member 8 may be lett oli` if desired. The link G also may be left oil if desired, in which case the bendable wire 7 would pass through the staple 5. rEhe bending out of the staple 5, as shown in Fig. 3, provides means by which the nose engaging member may be kept out allowing more room for the nose.

ln the modication shown in Fig. 6 the staple 5 and the link G are used as in the case shown in TEigs. l and 2, but instead ci a single bendable wire 7 as shown in Fig. l a bundle of' wires 9 is used, being slipped through the link t) as is the wire 7. The ends l0, however, ot the bundle of wires 9 are passed into the retaining member 1l and soldered or otherwise held in place. rhe distance between the lens holding members 2 is regulated eX- actly the same as in the case ot the device shown in l, that is, by twisting the loops of the bundle 9 until the required pupillary distance is obtained.

From the foregoing description it will be seen that l have provided simple, eiiicient and economical means for adjusting the distance between the lens holding members of an ophthalmic mounting by which the pupillary distance may be maintained and have also provided a flexible arrangement whereby one lens holding member may be folded with respect to the other.

Having described my invention, l claim:

l. In a device of the character deserib-ed, a pair of lens holding members each having an eyelet connection on their nasal sides, a leose link connected to each eyelet and an endless ductile wire link extending through the links, the two sides of the ductile link holding means.

HARRY H. STYLL. 

